Patent application number | Description | Published |
20100195599 | SYSTEM AND METHOD FOR MULTI-USER AND MULTI-CELL MIMO TRANSMISSIONS - A base station can communicate with a plurality of subscriber stations in a Multi-User (MU) Multiple-Input Multiple-Output (MIMO) system. The base station includes a transmitter and plurality of antenna configured to transmit control information. The base station can transmit a resource block to a first subscriber station. The resource block includes at least two downlink reference signal (DRS) patterns. The base station can assign a first DRS pattern for use by the first subscriber station. The base station informs the subscriber station regarding the assignment by reserving a state in a downlink grant. In response, the subscriber station can utilize the first DRS pattern as a pilot resource element and, optionally, avoid other DRS patterns. | 08-05-2010 |
20100195624 | SYSTEM AND METHOD FOR UPLINK DATA AND CONTROL SIGNAL TRANSMISSION IN MIMO WIRELESS SYSTEMS - A mobile station includes a transmission chain capable of communicating via an uplink transmission to at least one base station in a Multiple Input Multiple Output wireless network. The mobile station includes a plurality of transmit antenna and a transmitter coupled to the plurality of transmit antenna. The transmitter includes a layer mapper that maps data and uplink control information to at least one layer. The mapping is performed prior to Discrete Fourier Transform precoding such that the data and uplink control information are multiplexed and interleaved. The transmitter is configured to simultaneously transmit the data and uplink control information on at least one of a plurality of transmission layers. | 08-05-2010 |
20130077582 | SYSTEM ACCESS METHOD AND APPARATUS OF A NARROWBAND TERMINAL IN A WIRELESS COMMUNICATION SYSTEM SUPPORTING WIDEBAND AND NARROWBAND TERMINALS - A system access method of a narrowband terminal is provided for supporting both wideband and narrowband terminals in a cellular radio communication system. The method includes broadcasting a Shared CHannel (SCH) for a terminal to acquire system synchronization; transmitting a Low-end Master Information Block (L-MIB) including control information on an L-subframe configuration for supporting a second type terminal and a sub-band configuration of the L-subframe; transmitting a Low-end System Information Block (L-SIB) including information on downlink reception and uplink transmission of the second type terminal; and performing a random access procedure, when an attach request is received from one of the first type terminals and the second type terminals. | 03-28-2013 |
20130163457 | CHANNEL STATE INFORMATION FEEDBACK APPARATUS AND METHOD IN WIRELESS COMMUNICATION SYSTEM OPERATING IN FDD MODE - A Channel State Information (CSI) feedback method and apparatus is provided for transmitting, at a base station, the CSIs for plural transmit antennas with a limited amount resource and receiving, at a mobile station, the CSIs efficiently in a massive Multiple Input Multiple Output (MIMO) system operating in the Frequency Division Duplex (FDD) mode. | 06-27-2013 |
20130163544 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING CSI-RS IN MASSIVE MIMO SYSTEM OPERATING IN FDD MODE - Methods and apparatus are provided for beamforming and information feedback are provided. Signals for beams to be transmitted through corresponding antenna ports, are generated. The beams are formed by precoding the signals with beamforming vectors. The beams are sorted into a number of resource reuse groups based on a resource that is to be shared. The beams are transmitted, using resources allocated per group, to a receiver. Feedback information is generated on at least one antenna port, based on the received beams. The feedback information is transmitted to the transmitter. A beam is selected having a greatest gain for a transmitter using the feedback information. A transmission resource is allocated for the selected beam. | 06-27-2013 |
20130310100 | CHANNEL ESTIMATION METHOD AND APPARATUS FOR COOPERATIVE COMMUNICATION IN A CELLULAR MOBILE COMMUNICATION SYSTEM - A channel estimation method and apparatus are provided for a terminal in a cellular mobile communication system including a plurality of base stations. The method includes maintaining a maximum number of CSI processes supported by the UE; receiving CSI process report information; determining a number of CSI to be updated based on the maximum number of CSI processes supported by the UE; generating at least one CSI report based on the determined number of CSI to be updated; and transmitting the at least one CIS report to an evolved Node B (eNB). | 11-21-2013 |
20130322372 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING PHYSICAL CHANNELS IN COMMUNICATION SYSTEM SUPPORTING CARRIER AGGREGATION - A physical channel transmission method using inter-eNB carrier aggregation is provided for improvement of peak data rate and system throughput in a wireless communication system. The physical channel transmission method of a terminal in a communication system supporting carrier aggregation includes receiving carrier aggregation configuration information from a network; aggregating a plurality of carriers according to the carrier aggregation configuration information; and transmitting an uplink control channel on a common uplink frequency on which a plurality of base stations join the carrier aggregation. | 12-05-2013 |
20140078990 | CHANNEL ESTIMATION METHOD AND APPARATUS FOR COOPERATIVE COMMUNICATION IN CELLULAR MOBILE COMMUNICATION SYSTEM - A method and an apparatus are provided for a data transmission/reception in a terminal in a CoMP system is provided. One or more valid subframes are determined for updating feedback information. The feedback information is updated at each of the valid subframes. A feedback information scheduling signal is received at a predetermined subframe. Feedback information updated at a most recent valid subframe, from among previous subframes, is transmitted according to the feedback information scheduling signal. | 03-20-2014 |
20140079100 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING CHANNEL STATE INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting and receiving CSI is provided for use in a wireless communication system using a plurality of antennas. The CSI transmission method of a terminal includes receiving a first CSI-RS and a second CSI-RS, transmitting a CSI indicator indicating one of the first and second CSI-RS corresponding to CSI to be transmitted, and transmitting the CSI generated based on the CSI indicator, until transmission of a new CSI indicator. | 03-20-2014 |
20140079146 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEM - A method and an apparatus are provided for transmitting channel state information of a terminal is provided. A first Channel State Information Reference Signal (CSI-RS) and a second CSI-RS are received. Channel State Information (CSI) is generated based on both the first CSI-RS and the second CSI-RS. The CSI is transmitted. | 03-20-2014 |
20140079149 | FEEDBACK METHOD AND APPARATUS FOR USE IN MOBILE COMMUNICATION SYSTEM - A method and system are provided for a terminal to measure channel quality and transmit channel state information to a base station in a wireless mobile communication system operating in a multi-carrier-based multiple access scheme such as Orthogonal Frequency Division Multiple Access (OFDMA). The feedback information transmission method of a terminal in a mobile communication system includes receiving configuration information corresponding to at least two reference signals from a base station, receiving, at the terminal, feedback configuration information for measuring the at least two reference signals and generating feedback information based on a measurement result, receiving, at the terminal, the at least two reference signals, and transmitting, by the terminal, the feedback information at timings indicated in the feedback configuration information. | 03-20-2014 |
20140112220 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING COMMON CHANNEL INFORMATION IN WIRELESS COMMUNICATION SYSTEM - Methods and apparatus are provided for transmission and reception of common channel information in a mobile communication system using multi-antenna-based beamforming. A number of beams to be used for transmission to a terminal is determined at a base station. The common channel information is generated corresponding to the number of beams. The common channel information is transmitted from the base station to the terminal through one of the beams. | 04-24-2014 |
20140112413 | DIFFERENTIAL CODEBOOK FOR TEMPORALLY-CORRELATED MISO DUAL-POLARIZATION ANTENNA - A code word selection method performed by a User Equipment (UE) in a wireless communication system is provided. The method includes generating a rotation matrix using previously selected codeword; generating a new differential code book using the rotation matrix and a differential code book; selecting a code word from the new differential code book; and performing data transmission using the selected code word. | 04-24-2014 |
20140126404 | INTERFERENCE-AWARE DETECTION METHOD AND APPARATUS FOR USE IN WIRELESS COMMUNICATION SYSTEM - Methods and apparatus are provided for transmitting and receiving control information, for interference detection by a User Equipment (UE), in a wireless communication system. A base station determines whether the UE supports interference-aware detection. When the UE supports interference-aware detection, the control information is generated that includes interference signal modulation scheme information and demodulation reference signal measurement information. The control information is transmitted to the UE. The interference at the UE is measured based on the received control information. | 05-08-2014 |
20140134993 | METHOD AND APPARATUS FOR CONTROLLING OPERATION STATE OF BASE STATION IN WIRELESS COMMUNICATION SYSTEM - Methods and apparatus are provided for controlling transition of an operation state of a cell in a wireless communication system. The cell includes a transceiver configured to transmit and receive signals to and from a terminal and another cell. The cell also includes a controller configured to transition an operation state of the cell from an active state to a dormant state, transmit a discovery signal, determine whether a cell activation signal is received from a node that controls the cell, and transition the operation state of the cell from the dormant state to the active state when the cell activation signal is received. | 05-15-2014 |
20140146765 | MIMO TRANSMISSION METHOD AND APPARATUS FOR USE IN WIRELESS COMMUNICATION SYSTEM - A method for canceling interference between multiple terminals scheduled on the same time/frequency resource for communication between a terminal and a base station using a plurality of antennas. The interference cancellation method includes receiving, at a terminal, control channel information from a base station, determining other base station information and other terminal information based on the received control channel information, receiving a data channel from the base station, and cancelling interference to the data channel based on the other base station information and other terminal information. The terminal is capable of mitigating interference caused by the signals transmitted to other terminals using the least information even with legacy terminal receivers having no interference cancellation capability. | 05-29-2014 |
20140233475 | SCRAMBLING SEQUENCE GENERATION METHOD AND APPARATUS FOR USE IN DEVICE-TO-DEVICE COMMUNICATION - A scrambling sequence generation method and apparatus of a device supporting Device-to-Device communication are provided. The method includes acquiring at least one of an identifier of the device, an identifier of a counterpart device and a preconfigured value; determining an initial value of the scrambling sequence for the Device-to-Device communication based on the at least one of the identifier of the device, the identifier of the counterpart device, and the preconfigured value; and generating the scrambling sequence using the initial value. | 08-21-2014 |
20140241192 | METHOD AND APPARATUS FOR EXCHANGING INFORMATION BETWEEN BASE STATION AND TERMINAL - A method and apparatus of exchanging information on the number of layers which is supported commonly between the base station and the terminals in Multi-User Multiple Input Multiple Output (MU-MIMO) environment is provided for performance enhancement. The communication method of a terminal in a wireless communication system according to the present disclosure includes receiving a reference signal and information on a number of layers supportable simultaneously from a base station, measuring a channel state value based on the reference signal and the number of layers, determining whether the measured channel state value fulfills a minimum required channel state value, and transmitting, when the measured channel state value fulfills the minimum required channel state value, a value determined based on the measured channel state value to the base station. | 08-28-2014 |
20140241274 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING FEEDBACK INFORMATION IN MOBILE COMMUNICATION SYSTEM USING MULTIPLE ANTENNAS - A method and an apparatus for transmitting/receiving feedback in a mobile communication system are provided. A method of configuring and receiving feedback information of an evolved Node B (eNB) includes transmitting configuration information on a plurality of reference signals including a first reference signal and a second reference signal to a User Equipment (UE); transmitting feedback configuration information including first feedback configuration information on the first reference signal and second feedback configuration information configured such that feedback information on the second reference signal is generated with reference to the first feedback configuration information to the UE; transmitting the reference signal to the UE according to the configuration information on the reference signal; and receiving feedback information including first feedback information according to the first feedback configuration information and second feedback information according to the second feedback configuration information from the UE. | 08-28-2014 |
20140254516 | METHOD AND APPARATUS FOR CONTROLLING INTERFERENCE IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting control information is provided for use in detection of interference an signal in a wireless communication system. An interference control method of a base station of a mobile communication system includes scheduling data to be transmitted to a terminal and transmitting control information including data channel information on the scheduled data and interference signal information to the terminal. | 09-11-2014 |
20140254702 | METHOD AND APPARAPTUS FOR TRANSMITTING AND RECEIVING CHANNEL RELATED INFORMATION - The present disclosure relates to a method and an apparatus for transmitting and receiving channel related information. A method of transmitting channel related information of a UE according to an embodiment of the present disclosure includes configuring a sub-channel corresponding to a part of a plurality of antennas of an eNB; acquiring a Channel Estimation Error (CEE) and a Precoding Matrix Indicator (PMI) corresponding to the sub-channel; and transmitting a Sub-channel Indicator (SI) indicating the sub-channel, according to the CEE and the PMI. In accordance with an embodiment of the present disclosure, the channel related information is efficiently transmitted and received in a system in which a plurality of antennas is used. | 09-11-2014 |
20140254703 | COMMUNICATION METHOD AND APPARATUS FOR USE IN MULTIPLE ANTENNA SYSTEM - A method and apparatus for transmitting and receiving signals is provided for use in a codebook-based closed-loop multiple antenna system. A method for receiving signals in a codebook-based multiple antenna system according to the present disclosure includes estimating a desired signal and an interference channel, determining a codebook index using the desired channel, a Hermitian of the desired channel, and the interference channel, and feeding back the codebook index to a transmitter. The multi-antenna system of the present disclosure is advantageous in suppressing the interference from other cells and maximizing the gain of the desired signal especially when the number of receive antennas is greater than the reception streams and in designing a codebook with high performance as compared to the Grassmanian codebook and low complexity. | 09-11-2014 |
20140274085 | METHODS AND APPARATUS FOR TRANSMITTING AND RECEIVING SIGNAL BY USING MODULATION ORDER OF INTERFERENCE SIGNAL - Methods and apparatus are provided for receiving a serving signal from a base station by a user equipment. A signal that includes the serving signal and an interference signal is received. A Log Likelihood Ratio (LLR) of the received signal is calculated according to each of a plurality of modulation orders applicable to the interference signal to obtain a plurality of LLR values. A modulation order of the interference signal is determined, based on the plurality of LLR values. The serving signal is reconstructed, based on the determined modulation order. | 09-18-2014 |
20140301320 | HARQ METHOD AND APPARATUS FOR COMMUNICATION SYSTEM - Methods and apparatuses are provided for data transmission of a User Equipment (UE) in a communication system supporting HARQ. A Physical Downlink Control Channel (PDCCH) corresponding to a second cell is received in a first cell. An Uplink/Downlink (UL/DL) configuration of the first cell is identified as an Uplink (UL) reference UL/DL configuration, if the UE is configured with at least two cells including the first cell and the second cell, a PDCCH corresponding to the second cell is monitored on the first cell, and a pair of the UL/DL configuration of the first cell and a UL/DL configuration of the second cell is a predetermined set. A Physical Uplink Shared Channel (PUSCH) transmission is adjusted based on the identified UL reference UL/DL configuration. | 10-09-2014 |
20140313915 | METHOD AND APPARATUS FOR EXCHANGING MESSAGES AMONG EVOLVED NODE BS IN COOPERATIVE COMMUNICATION SYSTEM - A method and apparatus are provided for supporting a CoMP communication by an eNB of a mobile communication system. The method includes: receiving a channel measurement report relating to at least one transmission channel from a UE; and transmitting channel feedback information including information of interference with surrounding eNBs performing the CoMP communication on the at least one transmission channel, to a central controller, based on the received channel measurement report. In the method, adjacent cells can cooperate to transmit data through a CoMP transmission for a UE located in a cell boundary area in a cellular mobile communication system. | 10-23-2014 |